Contrast injector



FIG. 1 is a front elevational view of a contrast injector showing my newdesign, the rear elevational view being identical thereto;

FIG. 2 is a side elevational view thereof, the opposite side elevationalview being identical thereto;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof.

The ornamental design for a contrast injector, as shown and described.